#! /bin/bash
#
# General launcher script for dgamelaunch actions. The idea is to symlink
# this (one) script into $HOME/bin and use it to run the others.

SELF="$0"
SCRIPT_NAME=$(basename $0)

usage() {
    echo -e "Usage: $SCRIPT_NAME $@"
}

cat-error() {
    cat >&2
}

report-usage() {
    printf "Usage: $SCRIPT_NAME " >&2
    cat-error
    exit 1
}

canonical-name() {
    local name=$1
    if [[ -d "$name" ]]; then
        printf "%s\n" "$(cd $name && echo $PWD)"
    else
        local dir=$(cd $(dirname $name) && echo $PWD)
        printf "%s\n" "$dir/$(basename $name)"
    fi
}

test-set-dgl-home() {
    if [[ -n "$DGL_CONF_HOME" ]]; then
        return 0
    fi
    local dir=$1
    if [[ -d "$dir" && -d "$dir/bin" && -f "$dir/dgamelaunch.conf" \
           && -d "$dir/chroot" ]]; then
        export DGL_CONF_HOME="$(canonical-name $dir)"
        export DGL_CONF_LOGS="$dir/logs"
        mkdir -p "$DGL_CONF_LOGS"
    fi
}

find-dgl-home() {
    test-set-dgl-home "$HOME/conf-dgamelaunch"
    test-set-dgl-home "$(dirname $SELF)/.."

    local link_target="$(readlink $0)"
    if [[ -n "$link_target" ]]; then
        test-set-dgl-home "$(dirname $(readlink $SELF))/.."
    fi

    if [[ -z "$DGL_CONF_HOME" ]]; then
        echo -e "Cannot find dgamelaunch config base directory"
        return 1
    fi
}

resolve-action() {
    local action="$1"
    local script="$DGL_CONF_HOME/bin/$action.sh"
    if [[ ! -f "$script" ]]; then
        cat-error <<EOF
Can't find dgamelaunch action '$action'

Available actions are:
$(list-all-actions)

EOF
        exit 1
    fi
    echo "$script"
}

find-dgl-home || exit 1

ACTION=$1
shift

find-all-actions() {
    local -a actions
    actions=($DGL_CONF_HOME/bin/*.sh)
    actions=(${actions[@]%%.sh})
    actions=(${actions[@]##$DGL_CONF_HOME/bin/})
    echo "${actions[@]}"
}

list-all-actions() {
    find-all-actions | fold -s
}

if [[ -z "$ACTION" ]]; then
    usage "<action>"
    echo -e "Where <action> is one of:"
    list-all-actions >&2
    exit 1
fi

ACTION_SCRIPT="$(resolve-action $ACTION)"
[[ -z "$ACTION_SCRIPT" ]] && exit 1

cd "$DGL_CONF_HOME"
source ./sh-utils

SCRIPT_NAME="$SCRIPT_NAME $ACTION"
source "$ACTION_SCRIPT"